Boot upper



FIG. 1 is a perspective view of a boot upper according to a first embodiment of my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view of a boot upper according to a second embodiment of my new design;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a right side thereof;

FIG. 12 is a left side view thereof;

FIG. 13 is a top view thereof; and,

FIG. 14 is a bottom view thereof.

The dashed lines in the figures are for illustrative purposes and form no part of the claimed design. The stippling in the design indicates contrast and does not indicate color. 

CLAIM The ornamental design for a boot upper, as shown and described. 